Malicious PDF — malware analysis report

Static analysis result for SHA-256 f886b28f46519d6e…

MALICIOUS

PDF

99.9 KB Created: 2021-04-11 11:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f4052e1ab89ec9b3bd0f48871900ae4d SHA-1: 29028f5d5f4c95181f81704c95ea08c39de7cedc SHA-256: f886b28f46519d6e76de56f8686104766dbafd960c3597156cacdee272ec7905
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results. The primary URL, 'https://druttle.ru/strik?utm_term=why+is+my+simpson+washing+machine+leaking+water', suggests a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate 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://druttle.ru/strik?utm_term=why+is+my+simpson+washing+machine+leaking+water PDF link annotation
    • http://enots.space/49500145796cnjzn.pdfIn PDF document text
    • https://wademaleg.weebly.com/uploads/1/3/5/3/135346716/veregitevokiravuwa.pdfIn PDF document text
    • https://rixowumunek.weebly.com/uploads/1/3/5/3/135330445/3543132.pdfIn PDF document text
    • https://nozipukox.weebly.com/uploads/1/3/6/0/136057246/1550045.pdfIn PDF document text
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/2425754.pdfIn PDF document text
    • https://veponigizut.weebly.com/uploads/1/3/0/9/130969631/vipixedisisow.pdfIn PDF document text
    • http://retys.space/what_is_categorical_data_give_exampleyejkp.pdfIn PDF document text
    • https://mozovarowojexi.weebly.com/uploads/1/3/4/8/134867055/2262312.pdfIn PDF document text
    • https://xopekasas.weebly.com/uploads/1/3/4/7/134748476/povadazej.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/dexej_somupujomabeven_xilekamifimig.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/tanefapot-jewolix-lekutolupi.pdfIn PDF document text
    • https://jisawawaxiwibes.weebly.com/uploads/1/3/1/6/131606947/7465154.pdfIn PDF document text
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/2735586.pdfIn PDF document text
    • https://gimelasu.weebly.com/uploads/1/3/4/5/134513778/tunulezi-zofefoginix.pdfIn PDF document text
    • http://keepxufi.space/90893118960bhguq.pdfIn PDF document text
    • http://mx50off.pro/dutebevix00qw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3420a290-e659-49de-bb42-91f703e621a4/derumifodafejituvoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2365194-7d20-427a-8a64-bec439e9dda8/everybodys_protest_novel_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/goodes_world_atlas_23rd_edition_free.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/kuvinesumunirazukisimeri.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/learn_russian_rt_answers.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_off000140b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B0 2828 bytes
SHA-256: 4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9
font_01_sfnt_off00014aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAB 5620 bytes
SHA-256: 562b16025bc5c03edd65789b9995cb135cc18d333cb6c2341f3eec62fc085d76
font_02_sfnt_off00015dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBF 10580 bytes
SHA-256: 9aea28a549de5a97e70c8645509008d28d91da987c4c1369caa5cf84b2f832e1