Malicious PDF — malware analysis report

Static analysis result for SHA-256 43205530ade7db95…

MALICIOUS

PDF

105.8 KB Created: 2021-04-23 21:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7836da6410aa3ff5b982aa07dbee9153 SHA-1: 76722415083bc5c7bd0b7525ab9500b50389ffcd SHA-256: 43205530ade7db95b7f16ea7f336a2a3a1a2a68dedc634da3c75c60fb430032c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://maypoin.ru/strik?utm_term=dell+precision+workstation+t7400+bios+update PDF link annotation
    • https://cdn.sqhk.co/xomatujod/8YqaVhf/87004289030.pdfIn PDF document text
    • http://lbaranaydin.com/how_to_do_lateral_running_side_to_side_drillsaeqwr.pdfIn PDF document text
    • https://cdn.sqhk.co/diwomijo/iE5ifgh/password_reset_disk_windows_8._1_usb.pdfIn PDF document text
    • https://dexetejitifite.weebly.com/uploads/1/3/4/5/134576896/e45bc6a.pdfIn PDF document text
    • https://cdn.sqhk.co/dojarodawiw/hffijjb/paduxuzelamizemani.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_60405b509de5c.pdfIn PDF document text
    • https://sepiboberad.weebly.com/uploads/1/3/1/1/131164555/togaguz.pdfIn PDF document text
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/4925002.pdfIn PDF document text
    • http://hargotel.xyz/kitexelapisawiwurlrwoq.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/huobZx9/laser_quest_montreal_cost.pdfIn PDF document text
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/gusixexixupux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_6009edb16ed7b.pdfIn PDF document text
    • https://tinabatof.weebly.com/uploads/1/3/0/7/130776088/bazanebakojezeva.pdfIn PDF document text
    • https://pakokapixufepu.weebly.com/uploads/1/3/4/6/134659136/wojurisanulef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_601f0b95c7455.pdfIn PDF document text
    • http://legendarycraft.ru/big_short_michael_burry_twitter79otd.pdfIn PDF document text
    • http://labiosdewonda.com/this_is_water_-_full_version-david_foster_wallace_commencement_speech4553h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_604ab783bd03f.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/c2Pgild/lead_king_loop_trail.pdfIn PDF document text
    • https://razosuxox.weebly.com/uploads/1/3/4/7/134719946/soxesesusit-kajanabi-faganuj-gaperetegerinen.pdfIn PDF document text
    • https://kotekadugufed.weebly.com/uploads/1/3/6/0/136086248/sefupavupebaz.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/253701755144ggmp.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://13cfbe10-32e4-4d7a-9072-8dbd3280e6b8.filesusr.com/ugd/994e9e_21c675af2d14416ba5a09620b5d5d524.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_280d8fc79bb543688694af5e8cef78d3.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D69 5556 bytes
SHA-256: fad23344305b1a6cc7881bfae3ba90226febfb7047438facd426e77e80ad74f0
font_01_sfnt_off0001606a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1606A 11872 bytes
SHA-256: 03ffd9847ff4344d714d20fcceeb46ef2965ea7e50fdd3a491ad7b9cd6b01837
font_02_sfnt_off000188d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188D4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f