Malicious PDF — malware analysis report

Static analysis result for SHA-256 a780aff691cdf49e…

MALICIOUS

PDF

78.1 KB Created: 2021-03-31 20:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bd6a2c2772e5535a2171e08942c3e5f3 SHA-1: 6c607d0168f834fed1c2e938fa85235bda965bd5 SHA-256: a780aff691cdf49e7ff425775a75abd0a536c39f87b36480e6e83e56b0f175f9
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of external URIs and the overall structure point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=self+guided+tours+near+me PDF link annotation
    • http://finansi-7.online/partes_de_la_revista_de_divulgacin_cientfica_para_nios80i8k.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/lizuxavegope.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/Riehcha/webukokapejafodejajezow.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/gLngcgg/best_3_point_shooter_in_2k20_all_time.pdfIn PDF document text
    • http://rastet-malysh.ru/sasimijederijolewufadenmnozz.pdfIn PDF document text
    • https://talotemeve.weebly.com/uploads/1/3/1/6/131606578/62a92a.pdfIn PDF document text
    • http://pidagenavuziw.mywebcommunity.org/5813416846.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/wuvonoruvisime.pdfIn PDF document text
    • http://wiwovurezibaso.getenjoyment.net/bundesliga_spielplan_18_19_download.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/8877491274.pdfIn PDF document text
    • https://wilosobofixi.weebly.com/uploads/1/3/4/8/134858013/820f4d8d6e67ca.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/ijDgg2Y/flying_hedgehog_rush.pdfIn PDF document text
    • http://zopesozali.mypressonline.com/tuserekuburubaripakonog.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/gubozajawe.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/maze_runner_saga_order.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejegaba.atwebpages.com/zakewufubutaxodoferokos.pdfIn PDF document text
    • http://bebovufuvuji.myartsonline.com/accel_world_light_novel_english.pdfIn PDF document text
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_fb32e8aec3a44a75b9cc3fcf1d2b4bf3.pdf?index=trueIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_094902a953204fcfa5542ece7e353d8e.pdf?index=trueIn PDF document text
    • http://namakanexir.atwebpages.com/65134821369.pdfIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_c5bfe02133ba41a9a7a0c0e990c959be.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_47d07eda4fd34ab6adc825a759fb13f0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CA 5332 bytes
SHA-256: d56584161b68367184f0677ba497f1b5a2128db260063fc251fbb8fb029b3cd7
font_01_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 10868 bytes
SHA-256: e29d514878fe7eb82ed1292fccd95305e6bf584416699edb7888b9e767a6b19d