Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dc7916651b37c0e…

MALICIOUS

PDF

81.8 KB Created: 2021-06-01 20:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ecada203f3dec13e717ce920b69975ec SHA-1: 289d99530991ac0c2c21094ff09de215150c3ed2 SHA-256: 2dc7916651b37c0ef6068f189f612b710852723126c600a855a46670ce7a8072
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://smidgel.ru/pbw?utm_term=physics+objective+questions+for+12th+pdf+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463538/normal_605e013716a34.pdfIn PDF document text
    • https://xifatame.weebly.com/uploads/1/3/5/3/135316237/firutufe-gibod-tepejanomamibuj.pdfIn PDF document text
    • https://pifabesi.weebly.com/uploads/1/3/5/9/135958575/zasizejub.pdfIn PDF document text
    • https://wavujuwaliv.weebly.com/uploads/1/3/4/3/134375487/juwiludimoz-fawadaganek-xanosabawafa-giwafamuvop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_6065543700769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387811/normal_60582177aebf7.pdfIn PDF document text
    • https://miruvogix.weebly.com/uploads/1/3/1/4/131408245/ec1f9.pdfIn PDF document text
    • https://jawutasujo.weebly.com/uploads/1/3/0/9/130969833/7978254.pdfIn PDF document text
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/tujafekerepakufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420934/normal_600dc54ded31f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/c098ce32-8312-4ce8-acda-3b9b0efbf544/dafuzelibuvapidumafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/413ae0bf-e4c1-4ccb-9e74-1556a39eabb6/en_iyi_engel_bulmaca_oyunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0576ad1-857a-4e73-9f46-83697126045e/thomson_reuters_journal_list_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31dbf0a-1949-47ed-86e4-815c0a1e2aac/lifan_125cc_engine_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4706f1d4-6587-4cd5-9b53-0eced59e26dc/48581775867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cad7739-c7b0-497a-a285-348366a837b9/13752650400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/077c20e2-0e8c-4df0-9c6d-805df964472a/how_much_do_military_aircraft_mechanics_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b1122b-6f84-4193-be6a-cdb6995ec9dc/perimeter_of_polygons_worksheets_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0463f04f-7552-4fbc-86b1-9261bcde1103/call_name_location_tracker_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d384dc-5b7a-481d-9483-935226501de7/sivapuranam_in_tamil_audio_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f312b39f-4afe-4530-beb4-36722cd8d7a1/huckleberry_finn_movie_disney.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 5832 bytes
SHA-256: 57c39d9ccda0bf811501e1eb0454c3c92e41da237d650ed98fffcdeedd84e12c
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 6068 bytes
SHA-256: d8e4b7f44dfb66ea49c7f1cefd345a391fade3fb548cc17de4cdbf151663dabd
font_02_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 10584 bytes
SHA-256: e2937bfa8293c5c5ed1fe4587c5021eb4503ce79ac12ba345b96d11cb7a7a319
font_03_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 2956 bytes
SHA-256: d42dbc2eef642daf764779fca075bab3e44c71df143224ed6d6a32543a05e8f8

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