Malicious PDF — malware analysis report

Static analysis result for SHA-256 a15b79503c3ea830…

MALICIOUS

PDF

78.3 KB Created: 2021-03-23 12:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b133fbe653eb70e84ebeb4bd5a5f21d9 SHA-1: 6ee445f17553ae0acc8e4180148a83a39b585da4 SHA-256: a15b79503c3ea830a2a194130a0e44fa002d641cdb3417a5316c085b66dfc488
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The presence of 'utm_term' in one of the URLs suggests a phishing or spam campaign. While no scripts were extracted, the structure and numerous external links strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/123?utm_term=minions+hd+wallpapers+4k PDF link annotation
    • http://tedurelaseji.mygamesonline.org/xuvufigibinijemobisa.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/cfBE2vX/wusakisug.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/biodegradation_of_cellulose.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/jgekhgp/gladiator_fight_3d_battle_contest_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/gduMhbv/kogofapibisibudasexe.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/grpYhfq/34.pdfIn PDF document text
    • http://jajokojunewi.mypressonline.com/losisupuzenubotumon.pdfIn PDF document text
    • http://belepebo.mywebcommunity.org/beginner_bodybuilding_workout_plan_and_diet.pdfIn PDF document text
    • http://wabiferofuvud.mygamesonline.org/rukoliw.pdfIn PDF document text
    • http://fajufoturesu.sportsontheweb.net/24857980703.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_469ccce056b748a188bdf27af68fcf47.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_f1050d6c2c3e4270ada102c1ca418058.pdf?index=trueIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_77825f94feae46498e26107ed665681b.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_191586c4be624df48baab1b8e6ef6d18.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_5bbe23c8efc64c94b8ccbf09876a61f6.pdf?index=trueIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_0bb3f321dc154e719206994f07094a04.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e1850a-e873-4f69-9b17-7eeb72121e3b/mercury_xr6_150_years_made.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9a4f3e-1557-4d45-9ab7-c4ca395e2c13/not_your_cup_of_tea_meaning_in_hindi.pdfIn PDF document text
    • http://masusoxowep.onlinewebshop.net/rumenikadup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5f3c2e-095c-4df0-b3d3-ad7761d60211/82263460052.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_da49357e0225465b86911192f573e262.pdf?index=trueIn PDF document text
    • https://334e481f-4595-4613-8514-cf1b68b0f675.filesusr.com/ugd/a5bb32_9ef4a509fae94513ac59c17e60b54094.pdf?index=trueIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_12d9cdcbfc05463daa811afaf6e909ce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c57bd3f-1688-437b-82b6-a4c2bac5d20e/48586438997.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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5296 bytes
SHA-256: ec89a8e927b2ae4255f48e1b5eb71015f40ff51e60d99055d732d6625b330c92
font_01_sfnt_off000103bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BF 12016 bytes
SHA-256: 26bafa9e599748326dd874159ad219232fcab9ff30f985a42890a71fbe0d1099

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