Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a0b85f75727da4…

MALICIOUS

PDF

79.5 KB Created: 2021-04-04 00:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f98b5d6a138929f0270dea93b9e1809 SHA-1: b6a256227e27abf8f2142226409ce5e64b0b861b SHA-256: a3a0b85f75727da4dd61bee539fc8932d1491997b4fd2d7fc764183a480d73c3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, with numerous external URLs pointing to various domains, suggesting an attempt to redirect users to potentially harmful sites or for SEO manipulation. The presence of multiple external links on disposable hosting further supports a malicious intent.

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://botokaw.ru/strik?utm_term=what+is+an+example+of+a+solution+in+biology PDF link annotation
    • http://pipavinekiga.mywebcommunity.org/jeu_de_cartes_spider_franais_gratuit.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/grammar_practice_book_grade_4_harcourt.pdfIn PDF document text
    • http://gekenig.mywebcommunity.org/18841193182.pdfIn PDF document text
    • http://usblighter24.site/new_holland_7308_loader_attachmentt7f3k.pdfIn PDF document text
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/nogexoguri_mipeduvonebova.pdfIn PDF document text
    • http://nubemeketetu.mypressonline.com/buckling_analysis_in_ansys_workbench.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/jomudawo.pdfIn PDF document text
    • http://health2health.online/febo_flame_electric_fireplace_phone_numberwgzh6.pdfIn PDF document text
    • http://healthytrands.com/the_cost_of_discipleship_bonhoefferfzrpv.pdfIn PDF document text
    • http://prizinsta24.online/chick_fil_a_spicy_chicken_sandwich_calories_half_bunzgpww.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/8912500.pdfIn PDF document text
    • http://itfamily.pro/htc_m8_price_in_pakistan_olxaxryl.pdfIn PDF document text
    • http://moreprodukti.com/127146796597h5wb.pdfIn PDF document text
    • http://iceteas.space/waporonepepupusemodizikepwks50.pdfIn PDF document text
    • https://nimaxosonoj.weebly.com/uploads/1/3/4/8/134897368/a0eaf98e4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/vexugufufebapele.pdfIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_010ca6ce13444efead0f4134f16d3b5d.pdf?index=trueIn PDF document text
    • https://79c9c32e-6572-42fd-9c0e-61d057d48a34.filesusr.com/ugd/33a1c8_463c95ac366c4b5f8791b510bf92b06b.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_68ff14f6ec1248288f1b4738c66e8b9e.pdf?index=trueIn PDF document text
    • https://502f924d-676a-41b3-8220-87c01882f600.filesusr.com/ugd/5a20bb_1a76921f511c4d8e9e65413c6e2d47a2.pdf?index=trueIn PDF document text
    • http://kebenubes.onlinewebshop.net/jidujirenofux.pdfIn PDF document text
    • https://b7f5b04e-b247-49a4-9dc0-39f0c843ec09.filesusr.com/ugd/b56f86_626c8ff6828041d9906bdd7e8285ce6b.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_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 5540 bytes
SHA-256: c10da52fd692255db9538b5abd33e49001489c7b7ce1e9237a3cb252ad81234b
font_01_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 10808 bytes
SHA-256: d78e5927d9a829386290e0ae1a591fb8dff02177cb9a9c324180fdbfee17cc79