Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61f8a6a7de82e64…

MALICIOUS

PDF

86.0 KB Created: 2021-03-29 20:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ab211cd9ed883c233ccb2fe8d3791383 SHA-1: 08ad798c4d6aebc041f66afb7bb62361c622c0e5 SHA-256: f61f8a6a7de82e645edf17f42f33641a1bf4e7f2027ba3f3bd773c792a90f407
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to exercises, which is likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/award?keyword=aaos+back+pain+exercises+pdf PDF link annotation
    • http://xtrading.buzz/unblocked_games_77_tank_troubles9qxq.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/wozirojurosa.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/gACjjMs/barcode_scanner_sdk_android_free.pdfIn PDF document text
    • https://xadajosawot.weebly.com/uploads/1/3/1/6/131636584/depisolubovedo.pdfIn PDF document text
    • http://wordsidepost.top/the_complete_sherlock_holmes_doubledayt1yen.pdfIn PDF document text
    • https://bobixazila.weebly.com/uploads/1/3/4/5/134599816/gawiw-jukakope-buwaxuxadikuno-manam.pdfIn PDF document text
    • http://kataeta.club/38225360853ub896.pdfIn PDF document text
    • https://cdn.sqhk.co/nulaliki/i1yheid/10363476270.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/hi6gif2/vrchat_avatars_anime_girl.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/ru0OUji/32118138429.pdfIn PDF document text
    • https://cdn.sqhk.co/fumediju/YOuMEfv/wokuwafosibewigiga.pdfIn PDF document text
    • https://pagipakudux.weebly.com/uploads/1/3/5/3/135343553/kotenumemudekolebuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kejefutipetube.epizy.com/tiparu.pdfIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_1f17dc87c7374cf1ad15b9d6eb390e5e.pdf?index=trueIn PDF document text
    • http://ruxuwidoke.epizy.com/batibamamelisiziliv.pdfIn PDF document text
    • http://merazajujivu.epizy.com/bizemuvabesaferodutefiv.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_b834185cd8994d01a3a1a1198b145e87.pdf?index=trueIn PDF document text
    • http://zonuzaxesinok.rf.gd/66268670812.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_ae8c5035b81744c8bf51fbc441765b33.pdf?index=trueIn PDF document text
    • http://bazogito.epizy.com/refrigerator_works_but_freezer_not_freezing.pdfIn PDF document text
    • https://147762ec-90f0-4523-8579-43cb3cd17c82.filesusr.com/ugd/6c48b9_446eacef832c4e8cb873e5889fe68056.pdf?index=trueIn PDF document text
    • http://satobagelovitok.rf.gd/togujav.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 5380 bytes
SHA-256: 8f6b2c45f93d81e35122986fe54a1cfbfc5e80d0fead4ae7940102a39e35c2eb
font_01_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 11112 bytes
SHA-256: 0fd29a4198157f4da259a91e9e70af3dc77d4bdd8f6c1eba03d1154cd5317c80