Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1c4ae3b3040c9e…

MALICIOUS

PDF

85.8 KB Created: 2021-04-06 15:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 244e8b92c5e8635cca2b226b955f00ea SHA-1: b19eeefae93e7db86d30c3310d97e97f29104cf3 SHA-256: 8e1c4ae3b3040c9e94c7a9335156fb474740eb387103e1254e61c315f286c374
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content, with a critical heuristic identifying it as a link farm and a high-confidence heuristic flagging it as an SEO redirector for free-download phishing. The primary URL, https://golowaki.ru/strik?utm_term=what+order+were+the+new+testament+books+written, is likely a redirector to a malicious site. While no scripts were explicitly extracted, the PDF structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=what+order+were+the+new+testament+books+written PDF link annotation
    • https://famogapev.weebly.com/uploads/1/3/1/6/131606489/sapat-nimetodukavon.pdfIn PDF document text
    • https://cdn.sqhk.co/falugojafat/jhjgfgc/duxosoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xurawupo/jcjekqn/machine_robo_rescue_episode_10.pdfIn PDF document text
    • https://lafupoboj.weebly.com/uploads/1/3/1/8/131857117/77bdc6eb.pdfIn PDF document text
    • https://kuwovuvonix.weebly.com/uploads/1/3/5/9/135971109/jedufavidurudego.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/mabemow-piviwefozoboman-famuxozo-dogafafoginanov.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/fefoja-laluvudemuzuj-pitopupivipunol.pdfIn PDF document text
    • https://zudomizat.weebly.com/uploads/1/3/5/3/135308615/2947846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_6026eb405b61a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_60628313b0a31.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/hNQhdVf/11013804118.pdfIn PDF document text
    • https://roriwemako.weebly.com/uploads/1/3/4/5/134599113/movoguranekogob-xakixagejagapa.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/3554094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_606840cc57fa7.pdfIn PDF document text
    • https://tateleref.weebly.com/uploads/1/3/5/3/135322569/xepenulej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403960/normal_60403df37372e.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/babetafaperaxov/69881501981.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/goldendoodle_coloring_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/001dbe29-9a07-4c97-8fa4-7fec971fe128/medline_wrist_blood_pressure_monitor_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72003fc6-00fd-4dae-b97e-21548c79210e/what_word_describes_rise_and_fall.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/what_are_the_ores_of_gold.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6696e362-b835-46dc-b132-cc5a218238a1/xoxibijidejisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/xobebaxiluwabowokibapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12f62857-5607-4eae-a7f2-3dc7063cc0db/bella_waffle_maker_recipe_book.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/cost_of_young_living_oils_per_drop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa197c67-a295-4aeb-81f5-4f2c0f765a82/matlab_function_return_multiple_vectors.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 5128 bytes
SHA-256: b52bf2bb6af6a623ba55ebad41c0bd80fc92249de269cdaaf08d217c89ed79c4
font_01_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 10624 bytes
SHA-256: 1c356a7dbdced8a0dc2a0057f332d40cbefa43c7f879e484f412878c601bf722
font_02_sfnt_off00013b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B30 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378