Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2f780b0354feda…

MALICIOUS

PDF

68.9 KB Created: 2021-06-07 13:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0312bfda4a0d401036f1d64f82a7a2a3 SHA-1: d8a18056b6dc255b6940cb66d85cea3fd344d3ae SHA-256: 7c2f780b0354feda91358be67ef4b365579788e8c4e55b9a9f83dfca6e6e1b5f
244 Risk Score

Malware Insights

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

The sample is a PDF containing a large number of external links, many of which point to disposable hosting services or known redirectors. This behavior is indicative of a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=aitsl+standards+pdf+highly+accomplished In PDF document text
    • https://fokorakadugapo.weebly.com/uploads/1/3/4/4/134444193/fibajofamifa.pdfIn PDF document text
    • https://naridinefe.weebly.com/uploads/1/3/5/9/135959872/1470273.pdfIn PDF document text
    • https://tuxenovizomojow.weebly.com/uploads/1/3/7/5/137516496/b50ea489188a7f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5fd7871f9f9d4.pdfIn PDF document text
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/rolakoxalobikenekode.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/a1dd99.pdfIn PDF document text
    • https://nezumise.weebly.com/uploads/1/3/4/2/134265586/luwemobupibek.pdfIn PDF document text
    • https://mokekisinuru.weebly.com/uploads/1/3/4/3/134366850/nufivamudolazame.pdfIn PDF document text
    • https://nanawoxemataxu.weebly.com/uploads/1/3/5/3/135332584/8316992.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370317/normal_60b526df5d095.pdfIn PDF document text
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/3847361.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5fd309eebc06a.pdfIn PDF document text
    • https://xokaxopo.weebly.com/uploads/1/3/2/3/132302824/bemasa.pdfIn PDF document text
    • https://ludutuwe.weebly.com/uploads/1/3/4/6/134687162/nilasaduxaji_tezabeve_xotas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_600f921dcfc7a.pdfIn PDF document text
    • https://tirawinuzupufe.weebly.com/uploads/1/3/4/4/134445233/f4782.pdfIn PDF document text
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/52fe96ae531.pdfIn PDF document text
    • https://kunisalopug.weebly.com/uploads/1/3/4/3/134315348/7fc95ccac4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_604c9ab2ddd2c.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/d7686cb6-2766-4a63-9eca-b872bb650270/xewemamelemumupaxifupowij.pdfIn PDF document text
    • http://nefusim.pbworks.com/f/12473199551.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/835f24b5-f4ba-41cb-b091-4c4cab385ea1/9701695786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/178e6eb8-845c-47e5-af18-9c6721017179/how_to_draw_eye_liner_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7553b42-2601-4bda-b950-11ed0baf22b3/new_dance_group_songs_for_wedding.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/best_buy_lenovo_laptop_15.6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58f7b1e2-2b1b-42b7-b53e-2d526925097d/50704732922.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_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 5660 bytes
SHA-256: 79b8595b8c16c0d2410c1e4641bc735a28717e781608b7ba430c16dbfa2897d4
font_01_sfnt_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 9940 bytes
SHA-256: 7cc5d1400d1ad13f436801d1d0a531ae73d768a26313aa39a136d47964ed2c6f

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