Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb55d7a0f3a0341d…

MALICIOUS

PDF

108.1 KB Created: 2021-02-23 06:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 484f411e0656d8ddeae5bb4273256276 SHA-1: 95215c3d2aa22cc783d0a61c2032a051380b1b06 SHA-256: fb55d7a0f3a0341dc9d9ff3edf044e212ab99ba2362e15a32aa11b33634f4ef7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The primary function appears to be a link farm, containing numerous external URLs pointing to other PDFs hosted on disposable domains. This technique is often used for SEO manipulation or to distribute further malicious payloads, as suggested by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/123?utm_term=daisy+powerline+880+instruction+manual PDF link annotation
    • https://lalupapetawosi.weebly.com/uploads/1/3/2/8/132816164/9468d641a9.pdfIn PDF document text
    • https://rawuwivusezorom.weebly.com/uploads/1/3/1/4/131406564/5017627.pdfIn PDF document text
    • https://ligibumifi.weebly.com/uploads/1/3/4/6/134647936/xupunemigoremexasim.pdfIn PDF document text
    • https://cdn.sqhk.co/noxavuris/PqggCii/tapalu.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/0464914046f3206.pdfIn PDF document text
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/61ab756b.pdfIn PDF document text
    • https://jaxanotev.weebly.com/uploads/1/3/1/1/131164383/libelotuvijixixewi.pdfIn PDF document text
    • https://xavexipaw.weebly.com/uploads/1/3/1/6/131636683/65d2b7f5.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/rasiw.pdfIn PDF document text
    • https://lekumoga.weebly.com/uploads/1/3/2/6/132683130/lirirudizobojufu.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/zixujewewukut.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/ajhc7nC/potajizebo.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/FhhjdbS/59772962761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485152/normal_601e3f3e44c1f.pdfIn PDF document text
    • https://pibubalawuna.weebly.com/uploads/1/3/4/3/134316337/sedokajojexolor.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/vejaj.pdfIn PDF document text
    • https://durafozo.weebly.com/uploads/1/3/0/7/130740533/efc41e47a497.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/xeretesije.pdfIn PDF document text
    • https://cdn.sqhk.co/wepigosogo/jgjCLhh/blackjack_all-_in-_one_trainer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 6632 bytes
SHA-256: 92472130c1a224c839e97072f3707e4952593fcae0e1b4930bb04e2a617249da
font_01_sfnt_off000114b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 4600 bytes
SHA-256: 2912873de807f3df1497cf89470b0e4b253a69031026db39a320ab0e7367a845
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 5492 bytes
SHA-256: 4e72c2453d3219c7bbe259b9ede6e0558fc0e1479f7549fb1bb3da00bae3ddf7
font_03_sfnt_off00013753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13753 15716 bytes
SHA-256: 28726cd95c36bde2ef66c7603052afefa4dd1f15e590f6da5c9988e17bfd184b
font_04_sfnt_off00016969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16969 17096 bytes
SHA-256: 0b3c0690de1af30abbdcb572a1cec0b2c06829dbb397dba6628a22e8dab846ac
font_05_sfnt_off00018214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18214 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71
font_06_sfnt_off00018fd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FD6 6136 bytes
SHA-256: b6e51a23e2b47f35c1bcb026a3b3d4db2d9d7179abe6877b6f5f926f92b2adb2

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