Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfd3de1bfe2e258…

MALICIOUS

PDF

115.1 KB Created: 2021-02-28 18:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a68ff582b117303caf7b5d7985b97f01 SHA-1: 1f015bfb9043a3dc02873d25e28d67b22e440533 SHA-256: acfd3de1bfe2e258bb6b13dd3077d3467ad8d1530e41e8446e4faa2c2bfe559f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by ML and ClamAV as malicious, with high confidence. It contains numerous embedded URLs pointing to disposable domains, indicating a likely phishing or malware distribution scheme. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies the document as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=how+many+magic+tree+house+super+edition+books+are+there PDF link annotation
    • http://tevojagi.iblogger.org/spotify_ios_9._3._5.pdfIn PDF document text
    • http://tdsevsvet.ru/pradhan_mantri_ujjwala_yojana_form_downloadz97oi.pdfIn PDF document text
    • http://kifikawi.66ghz.com/sheetrock_ceiling_patch_kit.pdfIn PDF document text
    • http://spindlndou.space/91682549968avjhd.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/vubevubigokaw-beganopot-vevesakiwofuxub.pdfIn PDF document text
    • http://prod-fruit.space/the_american_rattlesnake_cartoondwh53.pdfIn PDF document text
    • http://workshop-fb.ru/english_words_with_sinhala_meaningd3hde.pdfIn PDF document text
    • http://vovidumuf.22web.org/chronicles_of_narnia_prince_caspian_soundtrack.pdfIn PDF document text
    • http://mabay.fun/25493265665bmnt.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/zixagedajudiwar.pdfIn PDF document text
    • http://idealslimitalia-official.site/zapatipazezoja374ij.pdfIn PDF document text
    • http://supportcopyright.net/asus_rt-ac66u_b1_tomato_firmwarenb2ts.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/8338627.pdfIn PDF document text
    • http://klosheff.xyz/xajixudowuxevuguwedaturdv347.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
    • https://s3.amazonaws.com/lolijexejomak/kivadesapopafokuxej.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/chipotle_mayonnaise_nutritional_information.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/47405092177.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/15460069153.pdfIn PDF document text
    • http://gofirog.epizy.com/wazag.pdfIn 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
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F81 5124 bytes
SHA-256: b01feecf698191517ed0a63c536d98dcba06272bcca7c19685309b742b56ff5e
font_01_sfnt_off0001615f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615F 5696 bytes
SHA-256: 195a36502221240dc517eca5adb8c6fa5197c0fafadae8b5876b3c15118b1461
font_02_sfnt_off00017495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17495 11016 bytes
SHA-256: 725fc80dd1d793c7834970e7153cddd8aeb6ca1b037d689ea367a244a2d9db74
font_03_sfnt_off00019a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A7A 16132 bytes
SHA-256: 6820151f9a4816bccc9e85e605aef44ce22c8924dfcccd161584754f275bf028
font_04_sfnt_off0001af71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF71 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176