Malicious PDF — malware analysis report

Static analysis result for SHA-256 011c51b1177e040f…

MALICIOUS

PDF

81.7 KB Created: 2021-03-02 10:07:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b6442814a26dfb31129051e8ad2be751 SHA-1: e7ee58636d69d811f53aef6bf362dc55bbf945f3 SHA-256: 011c51b1177e040fb531f4750bce5bd4db01b4962a043db7a713508c4789b296
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=how+to+take+out+keurig+2.0+water+filter PDF link annotation
    • https://womutiliwefol.weebly.com/uploads/1/3/5/9/135964171/839825.pdfIn PDF document text
    • https://kaxamutibe.weebly.com/uploads/1/3/5/3/135348628/5854459.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/yfhfgjx/leseruxalusizoxuvowadof.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/765487915.pdfIn PDF document text
    • http://dokojekiferej.mygamesonline.org/41330082010.pdfIn PDF document text
    • https://pesasujax.weebly.com/uploads/1/3/4/8/134882000/bovide_forenagix_xaziw_lujepubixakevob.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/78986659584.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/1196053.pdfIn PDF document text
    • https://tixovokibena.weebly.com/uploads/1/3/4/1/134109053/796e573.pdfIn PDF document text
    • https://marejipafikelor.weebly.com/uploads/1/3/1/4/131437604/8138d95ffe584e.pdfIn PDF document text
    • http://setakini.22web.org/lilerano.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/bupaveg.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/BsIiigi/2019.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/how_to_yoga_breathing_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/jenotefi/ia8jhih/music_player_app_for_samsung_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/wamedexipun/fjdDhjH/my_cloud_login_page_not_working.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/gamimaxosanubonamiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sidepojedava.myartsonline.com/fegifujorev.pdfIn PDF document text
    • http://tinasixubu.epizy.com/birla_sunlife_mutual_fund_common_application_form.pdfIn PDF document text
    • http://xumusuriwo.rf.gd/largest_economy_in_southeast_asia_2019.pdfIn PDF document text
    • http://liraperuwuw.atwebpages.com/philips_voice_tracer_audio_recorder.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5180 bytes
SHA-256: 9f086adec5101342ee6ab7d7a86a2e17bc7a5bd1bc568080bf04873aff866fb2
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 12648 bytes
SHA-256: 2d9c13a3d97c7ac39a28ccc2af1498c11b84d28c389703c3a3c0684537ff3e81
font_02_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15