Malicious PDF — malware analysis report

Static analysis result for SHA-256 a150f5f5c578ac13…

MALICIOUS

PDF

72.8 KB Created: 2021-01-10 05:54:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b5eebe66f388074c5d9a8d844de4688b SHA-1: dec4eab4996dd9e7e03d8eabebff4d0ca8502ed5 SHA-256: a150f5f5c578ac1394edd34207595d95cf0c1962fe3c0359b1a0c5afebc24565
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to potentially malicious content, and the document body, though heavily obfuscated, suggests a lure related to 'North Africa map quizlet'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafficel.ru/123?utm_term=north+africa+map+quizlet PDF link annotation
    • https://cdn.sqhk.co/bolomekurufe/9tiiShi/bugasiji.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/jnidhb1/assistant_director_jobs_los_angeles.pdfIn PDF document text
    • https://cdn.sqhk.co/nalogigoke/jdiejit/dikamewexujabuvorixix.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/xawunujesap.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/JquIdgd/pancake_tower_nc.pdfIn PDF document text
    • https://muxekedov.weebly.com/uploads/1/3/4/7/134706321/109230.pdfIn PDF document text
    • https://cdn.sqhk.co/sifolilo/haLgjja/mitazozexusifa.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/hgifqjb/amazon_relay_app_for_drivers.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/DTZjbhc/luke_bryan_wife_pics.pdfIn PDF document text
    • https://xonujofepip.weebly.com/uploads/1/3/4/3/134385468/96d5a2414.pdfIn PDF document text
    • https://romevezijije.weebly.com/uploads/1/3/4/7/134756673/3486479.pdfIn PDF document text
    • https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/jasogotufigopum-fonuzuvepugaru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/badodemebo/7931453598.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/budgeted_income_statement_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/putlocker_game_of_thrones_season_4_episode_10.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/81285958347.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BF 5000 bytes
SHA-256: d26d94fb9dd727a8240c2f8841a23833af88261e25b69abf868f9bb50da5475e
font_01_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 10528 bytes
SHA-256: a3fc53504f0b8285b13928ebf98c04076eabefdb288edf7f4bd40c987073fac1
font_02_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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