Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04763bf191e9599…

MALICIOUS

PDF

81.2 KB Created: 2021-05-24 00:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 981df2fcb97a0b9d61bcaee2613e0f6a SHA-1: 2bee2abad7fa94baa119d1d609c4c02e434e6521 SHA-256: d04763bf191e9599a60156a0ac7e7db1a9650c9e7a36813664ceb59e9cce4f74
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule indicating a mass of external links, and a ClamAV detection for Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or SEO spamming campaign, aiming to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://jottigo.ru/strik?utm_term=why+is+my+lg+fridge+not+cooling
    • https://sixikubirosepup.weebly.com/uploads/1/3/3/9/133997641/1399202.pdf
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/fazugila-nikurewurufaz.pdf
    • https://jesokalatozu.weebly.com/uploads/1/3/4/5/134591365/341474.pdf
    • https://vilaluwavo.weebly.com/uploads/1/3/4/3/134338374/rudofelusapuviteja.pdf
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/1429598.pdf
    • https://levufiturosotin.weebly.com/uploads/1/3/4/4/134466711/kazozunav.pdf
    • https://pepesavujol.weebly.com/uploads/1/3/1/0/131071240/e1b03c85.pdf
    • https://bizuzekibokosu.weebly.com/uploads/1/3/4/4/134446479/kanadazafur.pdf
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/dolobu.pdf
    • https://manuxemewawi.weebly.com/uploads/1/3/4/4/134443751/newisazufepo.pdf
    • https://static.s123-cdn-static.com/uploads/4490365/normal_5fdd37235e954.pdf
    • https://puxibaso.weebly.com/uploads/1/3/0/9/130968956/623271.pdf
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/ruwavesuzij.pdf
    • https://fefodenajefive.weebly.com/uploads/1/3/1/4/131437461/rojuzomovom-negoluz.pdf
    • https://static.s123-cdn-static.com/uploads/4379240/normal_5fe3bc7515c21.pdf
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/vogapafesupubawot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e0f111eb-7077-4180-b962-04b8a79546de/diastasis_recti_exercises_youtube.pdf
    • https://uploads.strikinglycdn.com/files/301343bd-27a0-4bcd-aeae-00793e0e9742/the_millionaire_real_estate_agent_portugues.pdf
    • https://s3.amazonaws.com/zoxewudunigus/noxilaravusir.pdf
    • https://uploads.strikinglycdn.com/files/0b7cb97c-69e7-4696-8743-03e4ceb04953/lola_and_the_boy_next_door_wiki.pdf
    • https://s3.amazonaws.com/nonabafat/56617138992.pdf
    • https://uploads.strikinglycdn.com/files/9a24075c-d095-48c6-9f07-c59df0381408/defying_gravity_meaning_in_tagalog.pdf
    • https://s3.amazonaws.com/dixaleko/40005634318.pdf
    • https://uploads.strikinglycdn.com/files/a935bf3c-cd4b-459a-becb-5a3961bc4633/jusesimasuzaz.pdf
    • https://s3.amazonaws.com/nemafu/fesakoxo.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001014d.bin
56c461f44129adf1d1b7bb8ab9bd13804edf44619123199a853fd46e7fc1f8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 5340 bytes
font_01_sfnt_off0001136a.bin
f79d5ff8b92cfc88e48156eff0af815f769be06d27e2734bc4513662a0f25c6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1136A 10440 bytes

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