Malicious PDF — malware analysis report

Static analysis result for SHA-256 6811b192a46de274…

MALICIOUS

PDF

76.5 KB Created: 2021-03-04 22:00:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52ae8da2cb7ab49df63052661a952d3a SHA-1: 77d2bd0841ad82273af9b7a2411ee56cc8e4d092 SHA-256: 6811b192a46de274f360328c65466d018c87f1288bb43f463c1e75134e914dd6
186 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDFs, many hosted on disposable domains. This behavior is often associated with SEO manipulation or distributing further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/123?utm_term=what+does+the+ion+button+do+on+a+lasko+fan
    • http://frontglass.xyz/infantino_flip_front2back_carrier_reviews30ke9.pdf
    • http://juvizex.sportsontheweb.net/mabojajofiguvoza.pdf
    • http://pedalini.club/jepoxuraxavolurivixalolcfjdb.pdf
    • http://zivemigidefis.mypressonline.com/doririrazum.pdf
    • http://tebapewulodafe.getenjoyment.net/fagifisinuzubugelen.pdf
    • http://topepuxabi.iblogger.org/micromax_android_one_not_booting.pdf
    • http://rentline.pro/258425681671zp8q.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6ba812fd-7407-468e-a879-d7284e591ed6.filesusr.com/ugd/31a575_96e2ed7321194948b5396d5cd281507f.pdf?index=true
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_6e2da6f8d31b4095b085a4f2f1db4266.pdf?index=true
    • http://xokawetuvon.epizy.com/99883990918.pdf
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_dd284e0009944a239d480a6e6786ef3d.pdf?index=true
    • http://wimareji.rf.gd/best_free_wordpress_themes_for_writers_2020.pdf
    • http://dowibisewapidon.rf.gd/specialized_speedzone_sport_cadence_manual.pdf
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_603554a34cca4d5da457f321915e9502.pdf?index=true
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_02d91b9bc42741dd987e287b2138e22f.pdf?index=true
    • http://zajupulavofawi.myartsonline.com/13356592401.pdf
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_313f1d42abdd48bb97473fe7384dda88.pdf?index=true
    • http://zipemoluligera.myartsonline.com/44320869324.pdf
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_4620adccc4ac4d768cd83a03aa3b5f0a.pdf?index=true
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_8d8cdec0209842feac37e0d60ce57a64.pdf?index=true
    • http://fakolelapokaki.epizy.com/12780688186.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_off0000edcd.bin
b2ac5967f7a3fa31c6d69f82f6f11741f2fe9bc3d8f7e6d6df7d2809afa65a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 5116 bytes
font_01_sfnt_off0000ff42.bin
fa08c2eda1b838cc14c922714498a1a2fd9ca79e20ea040c7e50ea7937fdabef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10896 bytes

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