Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6163ee9843c778…

MALICIOUS

PDF

85.1 KB Created: 2021-03-28 09:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2405309636d721e9da59f3020da6d504 SHA-1: de81b6a0f4a4fcf9957528eef40aff8c843b09d3 SHA-256: 8e6163ee9843c778c041d1e463a355c7016f70ed591d475fa34574fc2e0d1d10
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://maypoin.ru/123?utm_term=elapsed+time+number+line+worksheets
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/vewavizolasiz_xaravezibig_dixenepemuki_luloxozomifax.pdf
    • https://robigatif.weebly.com/uploads/1/3/0/8/130873787/gupatefufezepa_texelila_jebamizaxuma.pdf
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/221db.pdf
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/daredodase-metuja.pdf
    • https://womerakuketuzal.weebly.com/uploads/1/3/1/8/131856195/figozaj.pdf
    • https://gagujaxerubu.weebly.com/uploads/1/3/5/9/135976614/1766899.pdf
    • https://riviruzo.weebly.com/uploads/1/3/0/7/130739493/4943287.pdf
    • https://vaxuzumop.weebly.com/uploads/1/3/4/8/134870956/nowarawof.pdf
    • https://fekukutetixamam.weebly.com/uploads/1/3/4/6/134636283/3475333.pdf
    • https://tijesefufejeje.weebly.com/uploads/1/3/4/8/134858706/nuworuwases_gidufodipami_zomajop.pdf
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/e761b61211c720.pdf
    • https://regogugone.weebly.com/uploads/1/3/4/8/134891767/c3ca2eceed.pdf
    • http://kuroramogesok.iblogger.org/52550298457.pdf
    • https://wogakidip.weebly.com/uploads/1/3/5/3/135384189/1067265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://supewomok.epizy.com/25051243151.pdf
    • http://tojozojorezew.epizy.com/tuloxosanirolimaniz.pdf
    • https://uploads.strikinglycdn.com/files/de353ad8-3795-4ed6-ad2b-4b6cae92c67b/what_if_movie_trailer_song.pdf
    • https://uploads.strikinglycdn.com/files/560e6b80-e8b8-4d06-a410-d58d2ccb379a/ap_biology_chapter_1_introduction_themes_in_the_study_of_life_answers.pdf
    • https://uploads.strikinglycdn.com/files/d747b8d2-e802-4686-a77c-9064ee28f266/how_much_is_a_2013_dodge_avenger_worth.pdf
    • http://wiwawilif.epizy.com/free_esv_bible_app_for_iphone.pdf
    • https://uploads.strikinglycdn.com/files/6c2edb43-89c3-4a17-a9ae-60787ba97833/effective_communication_skills_for_nurses_ppt.pdf
    • https://uploads.strikinglycdn.com/files/cb2bf322-51b0-45f8-a6f9-3dca74694f91/how_to_increase_brightness_in_casio_calculator_fx-991ms.pdf
    • http://mejesikuwuvaxax.rf.gd/bleacher_report_top_100_nba_all_time.pdf
    • https://uploads.strikinglycdn.com/files/bf9bdec8-e549-4799-8a6a-e0e14cbe17e2/79129288639.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd49.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 6440 bytes
font_01_sfnt_off00010d3d.bin
249cdfd8bcdffafe8c68b0e2e4c07edcb5e24d76a76d42c846700f9bd32dcb31
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 5452 bytes
font_02_sfnt_off00011fa5.bin
5c521f69864cc9e319adc10047e6cfbfd6506bcc585eb190a530764c1fdab29a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 11284 bytes